With signs of candidate drop-off, the Daily Caller and the Americans for Tax Reform Foundation, the group run by Grover Norquist, have opted to postpone its July 10 planned Republican presidential debate.

From the statement:

“Due to scheduling conflicts and impending changes in the Republican primary field, we have decided to postpone our debate. The Daily Caller will continue to provide our audience with the most compelling and insightful coverage of the 2012 Presidential election and ATR will continue to engage with the primary candidates to address the critical fiscal challenges facing our country.”

Mitt Romney had made clear he wasn't attending, and few others had committed publicly. And the ante is further upped for the Fox News debate in Iowa, two days before the Ames Straw Poll.

UPDATE: The Washington Post has more, with organizers saying they decided to delay as they await a decision from Rick Perry about whether to run.